score:11

Accepted answer

In TypeScript, you need to set the return value so if this string did so

const configValue : string = process.env.REACT_APP_SOME_CONFIGURATION

OR

const configValue: string = (process.env.REACT_APP_SOME_CONFIGURATION as string);

score:1

You can add this to your react-app-env.d.ts file

declare namespace NodeJS {
    interface ProcessEnv {
       //types of envs
        NODE_ENV: 'development' | 'production' | 'test';
        PUBLIC_URL: string;

    }
}

score:2

You could change this to a string or Undefined for a failing scenario like so

const configValue : string | undefined = process.env.REACT_APP_SOME_CONFIGURATION

score:3

Update on March 2021: With React 17 and typescript, you don't need to set the return the 'configValue' value, just use the env variable like you did before. My .env file like this

REACT_APP_STRING=some_string_dont_have_quotation_mark

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